Dunno how much fuel these airlines are taking to operate the Abz charter flt routes but for the 737-800 if they operate that at max take off weight they need 2400m of runway and 2090m for the a320, so unfortunately anything near max takeoff weight Aberdeen just doesn't cope, need to get their fingers out and get the runway up to a decent length, even extending it to 2500 m would be hugely beneficial as potential long haul would then be able to operate like thy do at both Glasgow and Edinburgh who's runways are just over 2500m